Breast-drill.



`L H. RUSBY.

BREAST DRILL.

APPLICATION man :uns M1911; Y

Patenmime 4, 1918.

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JOSEPH H. RUSBY, 0F NUTLEY, NEW JERSEY.

BREAST-DRILL.

Specification of Letters Patent.

Patented J une 4L, 1918.

Application led I une 1, 1917. Serial No. 172,166.

To all whom it may concern:

Be it known that I, J osnrn H. RUsBY, a citizen of the United States,and a resident of Nutley, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements inBreast-Drills, of which the following is a specification.

The principal objects of the present invention are, first, to providefor accommodating the handle, as well as the breast plate, of a drill tosuch obstructions as may and frequently do occur in practice so that thedrill can be used with either of these parts in such different positionsas may be most convenient, second, to provide for readily positioningthe .handle in normal position, and third, to provide comparativelysimple strong and eiicient means for accomplishin these results.

he invention will be claimed at the end.

hereof, but will be i'irst described in connection with the embodimentof it chosen for illustration in the accompanying drawings, in which-Figure 1, is a view, partly in longitudinal section, of a drillembodying features of the invention, showing parts in unclampedrelation.

Fig. 2, is a sectional view, drawn to an enlarged scale, andillustrating parts in clamped relation, and s y Fig. 3, is a transversesection through the handle.

In the drawings l is a tubular frame eX- ternally rovided with acurcumferential rib 2, and) with a cylindrical seat 3, having a flat 4.5, is a breast plate having a tubular shank 6, rotatably and detachablymounted in the tubular end of the frame.-

7, is a collar rotatable on the collar-seat 3, of the frame and havingone of its ends rolled or crimped around the rib 2, so as to permitrotary motion and prevent endwise motion of the collar. The collar 7, atits other end is provided with a contracted flange 8, through which theshank 6 passes and by the rim wall of which the shank may be clamped. 9,is a handle screwed radially through the collar 7 or more accuratelythrough a boss 10, thereon, and its end is adapted to press upon thecollar-seat 3. Since the shank 6 is tubular it accommodates the endportion of the spindle 11.

In use the end of the handle 9 usually presses upon the fiat 4 andcauses the flange rim of the collar to clamp the breast plate shank, sothat both the handle and breast plate are immovable in respect to theframe l. However by unscrewing the handle sufciently to free its endfrom pressing engagement with the flat 4, or other part of the seat 3,the handle and collar can be turned into and clamped in any radialposition that may be most convenient, and this can be done by the handwhich engages the handle. Whenever the handle is screwed home againstthe collar-seat the breast plate is clamped and held against turning bythe rim of the collar flange.

What I claim is:

l. In a drill the combination of a tubular frame provided with a collarseat, a breast plate having a shank turnably mounted in the frame, acollar mounted for rotation and not for end movement on said seat andadapted to engage and disengage said shank, and a handle screwableradially through the collar into engagement with the frame to cause thecollar to clamp and unclamp the parts. f

2. In a drill the combination of a tubular frame provided externallywith a circumferential rib and with a cylindrical collar seat, a breastplate having va tubular shank rotatively mounted in the frame, a collarro tatable on the collar seat in engagement with the rib and having acontracted ange through which the shank extends and by the rim wall ofwhich the shank may be clamped,

and a handle screwed radially through the collar and having its endadapted to engage the frame to clamp and unclamp said parts.

In testimony that I claim the foregoing I hereto Set my hand this 29thday of May,

JOSEPH I-I. RUSBY.

@opter of this patent may be obtained for five cents each, by adsressingthe Commissioner of Patente.

Washington, D. f

